Since you say they were in the attic, they probably have many errors. Plus they were probably stored right next to each other, meaning the magnetic fields of each disk would interfere with the surrounding disks.
That said, if you ever want to try to get any data off of them, do it sooner, rather than later. The longer they sit, the more errors they get.
If you really are going to try, I have a few 5 1/4 drives that were never used, and appear to have been in a good storage location. If you need an older computer to hook it up to, I have those as well. I'd be willing to sell them at little or no cost, if I knew they were going to get used, and not just scrapped to make a neat case mod.
